Flamingo
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Flamingo clear sky chart from 2005-11-05 to 2017-09-23.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.
Observation TypeMinimum conditions for hour to be usableOut of hours
Clear of CloudsTransparencySeeingSky Brightness
Planetary:50%(no limit)Average(no limit)Nighttime Hours
Deep Sky:70%Average(no limit)5.9Nighttime Hours
CCD Imaging:70%Below AveragePoor(no limit)Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

PlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
Night
68%
16258
18%
47048
16%
16220
71%
16220
30%
29987

By Month

MonthDays of MonthPlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
January1st to 15thNight
61%
718
18%
2327
18%
716
65%
716
29%
1404
January16th to endNight
61%
768
26%
2412
24%
768
66%
768
34%
1385
February1st to 15thNight
60%
700
26%
2108
22%
700
65%
700
36%
1224
February16th to endNight
69%
631
30%
1740
24%
631
74%
631
44%
975
March1st to 15thNight
66%
720
25%
1980
20%
720
71%
720
41%
1158
March16th to endNight
68%
768
27%
2112
22%
768
71%
768
44%
1178
April1st to 15thNight
77%
718
24%
1976
21%
718
79%
718
47%
1071
April16th to endNight
72%
720
25%
1844
18%
720
74%
720
44%
1077
May1st to 15thNight
81%
719
23%
1799
17%
719
82%
719
52%
1010
May16th to endNight
68%
598
15%
1720
13%
598
68%
598
29%
1117
June1st to 15thNight
62%
540
7%
1620
6%
540
62%
540
15%
1259
June16th to endNight
74%
540
6%
1620
6%
540
74%
540
18%
1199
July1st to 15thNight
76%
510
4%
1530
4%
510
76%
510
21%
1067
July16th to endNight
79%
564
10%
1595
10%
531
79%
531
27%
1015
August1st to 15thNight
76%
599
9%
1676
7%
596
76%
596
24%
1174
August16th to endNight
69%
764
5%
2101
6%
764
69%
764
18%
1582
September1st to 15thNight
70%
720
4%
1980
4%
720
70%
720
18%
1511
September16th to endNight
62%
689
5%
1903
5%
689
62%
689
15%
1467
October1st to 15thNight
69%
660
13%
1892
15%
660
70%
660
22%
1331
October16th to endNight
60%
704
17%
2112
17%
704
62%
704
22%
1458
November1st to 15thNight
64%
700
25%
2101
24%
700
69%
700
32%
1282
November16th to endNight
65%
720
27%
2160
25%
720
69%
720
32%
1300
December1st to 15thNight
67%
720
23%
2244
23%
720
70%
720
30%
1355
December16th to endNight
70%
768
24%
2496
26%
768
72%
768
35%
1388

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

Occurrence of each ForecastData
Points
Cloud CoverDay
5%425%6%47%7%8%11%36%
47843
Night
5%425%5%35%6%7%10%41%
47251
TransparencyDay
38%13%17%18%10%2
47544
Night
33%11%19%21%12%2
47054
SeeingDay
7%110%22%30%27%
6069
Night
7%111%28%35%15%
16267

By Month

Percentage Cloud Cover SE (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
6%5%25%336%6%6%12%42%
1611
16th to endDay
5%414446%5%9%9%44%
1809
February1st to 15thDay
6%3343245%5%8%50%
1750
16th to endDay
32123245%6%11%56%
1730
March1st to 15thDay
3314325%6%8%9%52%
1980
16th to endDay
431342446%11%53%
2111
April1st to 15thDay
22123245%8%13%52%
1972
16th to endDay
42144245%7%11%50%
2115
May1st to 15thDay
32133245%7%11%53%
2152
16th to endDay
8%4245%48%8%10%12%31%
2401
June1st to 15thDay
9%7%38%8%5%8%8%9%10%17%
2340
16th to endDay
6%438%8%5%9%10%12%13%18%
2340
July1st to 15thDay
6%336%7%5%10%10%10%14%21%
2340
16th to endDay
3415%8%5%10%11%11%14%23%
2465
August1st to 15thDay
46%36%7%6%9%8%10%12%24%
2256
16th to endDay
8%427%8%6%9%9%9%11%21%
2101
September1st to 15thDay
6%6%28%10%7%8%9%10%12%17%
1980
16th to endDay
9%8%47%8%5%8%9%10%11%15%
1894
October1st to 15thDay
6%438%8%47%8%8%11%28%
1738
16th to endDay
11%6%16%6%35%6%7%9%33%
1760
November1st to 15thDay
5%425%435%5%5%10%47%
1757
16th to endDay
6%4245%35%6%6%8%47%
1800
December1st to 15thDay
6%325%435%5%7%10%44%
1713
16th to endDay
33234347%8%12%46%
1728
January1st to 15thNight
6%5%25%5%35%6%7%13%39%
2327
16th to endNight
4425%425%46%10%48%
2412
February1st to 15thNight
7%32442445%8%51%
2103
16th to endNight
322343445%8%56%
1740
March1st to 15thNight
33135%25%5%6%8%54%
1980
16th to endNight
331442446%8%54%
2112
April1st to 15thNight
2213425%45%9%57%
1976
16th to endNight
43133345%6%11%51%
1844
May1st to 15thNight
211333446%9%59%
1799
16th to endNight
8%435%5%26%6%7%10%37%
1719
June1st to 15thNight
11%7%37%7%5%7%7%7%11%22%
1620
16th to endNight
4436%8%5%8%9%10%12%26%
1620
July1st to 15thNight
4425%7%46%8%10%14%31%
1620
16th to endNight
2425%6%36%7%10%16%34%
1703
August1st to 15thNight
4325%7%5%7%9%8%13%33%
1687
16th to endNight
7%5%26%7%5%7%8%10%12%26%
2101
September1st to 15thNight
6%5%36%7%5%7%8%11%15%23%
1980
16th to endNight
6%8%47%7%5%7%8%10%9%23%
1903
October1st to 15thNight
6%426%7%5%6%8%8%12%31%
1892
16th to endNight
10%6%36%6%46%6%7%9%33%
2112
November1st to 15thNight
5%4245%35%5%6%10%44%
2101
16th to endNight
7%424435%5%6%9%46%
2160
December1st to 15thNight
5%4245%46%6%6%10%44%
2244
16th to endNight
5%323435%5%6%10%49%
2496

Transparency (when cloud cover <= 30%)
Color Meanings:
Too cloudy to forecast Poor Below Average Average Above average Transparent
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
33%9%17%22%11%5%
1612
16th to endDay
32%9%14%21%17%4
1809
February1st to 15thDay
30%6%12%26%17%5%
1752
16th to endDay
20%6%16%32%18%5%
1730
March1st to 15thDay
25%8%18%25%19%2
1980
16th to endDay
25%7%17%26%17%4
2112
April1st to 15thDay
22%8%20%31%14%2
1972
16th to endDay
26%8%17%25%17%3
2115
May1st to 15thDay
24%9%19%26%14%4
2152
16th to endDay
40%15%19%18%5%
2405
June1st to 15thDay
54%18%14%10%1
2340
16th to endDay
50%20%19%8%
2340
July1st to 15thDay
46%23%22%7%
2201
16th to endDay
42%23%23%10%
2310
August1st to 15thDay
47%17%20%13%1
2243
16th to endDay
51%20%18%8%
2101
September1st to 15thDay
52%21%18%7%
1980
16th to endDay
53%19%15%8%1
1894
October1st to 15thDay
44%13%17%14%7%2
1738
16th to endDay
43%9%14%15%11%4
1760
November1st to 15thDay
34%7%12%20%20%4
1757
16th to endDay
32%8%13%16%22%7%
1800
December1st to 15thDay
35%8%14%20%18%3
1713
16th to endDay
28%9%15%25%18%2
1728
January1st to 15thNight
33%8%18%24%11%3
2327
16th to endNight
30%7%14%27%16%4
2412
February1st to 15thNight
30%6%10%25%18%7%
2112
16th to endNight
24%6%16%24%20%7%
1740
March1st to 15thNight
26%7%14%28%19%3
1980
16th to endNight
24%6%18%26%20%4
2112
April1st to 15thNight
21%7%17%32%19%2
1976
16th to endNight
24%7%15%27%21%2
1844
May1st to 15thNight
18%8%17%32%19%4
1800
16th to endNight
36%9%18%25%10%
1721
June1st to 15thNight
50%15%19%11%3
1620
16th to endNight
40%19%28%10%
1620
July1st to 15thNight
34%19%34%10%
1530
16th to endNight
29%16%35%16%1
1595
August1st to 15thNight
34%18%26%19%
1676
16th to endNight
43%18%25%12%
2101
September1st to 15thNight
40%21%26%10%1
1980
16th to endNight
48%16%21%10%2
1903
October1st to 15thNight
40%14%20%16%6%1
1892
16th to endNight
42%10%13%18%10%4
2112
November1st to 15thNight
33%7%12%22%19%4
2101
16th to endNight
33%6%13%18%21%6%
2160
December1st to 15thNight
33%8%16%21%18%2
2244
16th to endNight
28%7%13%29%17%2
2496

Seeing (when cloud cover <= 80%)
Color Meanings:
Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
17%5%22%34%20%
90
16th to endDay
13%11%19%35%16%3
96
February1st to 15thDay
5%325%35%23%6%
90
16th to endDay
4222%39%28%2
231
March1st to 15thDay
4122%40%28%2
270
16th to endDay
5%118%37%28%8%
288
April1st to 15thDay
314%43%29%8%
270
16th to endDay
7%110%37%34%8%
270
May1st to 15thDay
29%30%36%19%
288
16th to endDay
6%6%19%35%32%
331
June1st to 15thDay
14%18%17%26%31%
315
16th to endDay
6%111%26%53%
315
July1st to 15thDay
6%16%32%52%
305
16th to endDay
6%36%26%56%
326
August1st to 15thDay
7%38%30%48%
313
16th to endDay
10%39%26%49%
332
September1st to 15thDay
10%38%21%55%
315
16th to endDay
10%4429%50%
283
October1st to 15thDay
7%8%21%41%20%
255
16th to endDay
12%216%26%30%12%
272
November1st to 15thDay
7%111%29%34%15%
265
16th to endDay
7%124%32%30%3
270
December1st to 15thDay
13%15%24%36%9%
183
16th to endDay
7%18%35%39%8%
96
January1st to 15thNight
8%319%31%32%4
720
16th to endNight
5%321%40%26%1
768
February1st to 15thNight
8%221%40%25%1
704
16th to endNight
4118%43%31%
631
March1st to 15thNight
5%118%43%28%2
720
16th to endNight
4117%44%30%2
768
April1st to 15thNight
311%44%37%2
718
16th to endNight
7%10%45%32%3
720
May1st to 15thNight
29%39%42%5%
720
16th to endNight
8%17%22%47%13%
600
June1st to 15thNight
14%5%15%38%25%
540
16th to endNight
428%41%42%
540
July1st to 15thNight
435%40%46%
510
16th to endNight
316%35%52%
564
August1st to 15thNight
5%8%41%43%
599
16th to endNight
8%38%39%39%
764
September1st to 15thNight
7%49%33%44%
720
16th to endNight
9%310%38%36%
689
October1st to 15thNight
9%7%23%42%15%
660
16th to endNight
13%12%28%33%11%
704
November1st to 15thNight
6%118%34%33%6%
700
16th to endNight
8%115%35%34%4
720
December1st to 15thNight
7%214%40%32%3
720
16th to endNight
5%212%37%36%5%
768
Page generated at 2017-09-24 09:15:52. Version ac04

Copyright 2017 A. Danko


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